body {
    padding: 10px;
    background-color: #f1f1f1;
}

.nav {
    width: 100%;
    height: 30px;
    background-color: #fff;
}

.nav ul {
    width: 100%;
    height: 100%;
    display: flex;
    position: relative;
}

.nav ul li {
    width: 100%;
    height: 100%;
    text-align: center;
    line-height: 30px;
    box-sizing: border-box;
}

.EChartes {
    position: absolute;
    top: 30px;
    left: 0;
    width: 100%;
}


/* .EChartes div {
    display: none;
}

#main1 {
    display: block;
}

#main1 div {
    display: block;
} */